Answer :

2.83 m shifted from the position directly below the piece of the wood.

the wooden piece is floating on the surface of lake.


Hence, height of the lake= 2.5m


When sun is setting, then the rays of the sun will become approximately parallel to the surface of lake as shown in the figure. Hence, the sun rays will become perpendicular to the normal of the surface of the lake.


θ is approximately = 90°



using Snell’s law





From the figure shown





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